Incandescent-mantle chimney.



FTQF.

BENJIMAN FRANKLIN HARMAN, .OF TULSA, OKLAHOMA.

INCANDESCENT-MANTLE CHIIVINEY.

Specicaton of Letters Patent.

Patented Api'. 23, 4912.

Application filed February 25, 1910. Serial No. 545,899.

T o all 'whom it may concern:

Be it known that I, BENJIMAN F. HAR- MAN, a citizen of the United States, residing at Tulsa, in the county of Tulsa and State of Oklahoma, have invented new and useful Improvements in Incandescent-Mantle Chimneys, of which the following is a speci cation.

This invention relates to incandescent mantle chimneys, the obj ect of the invention being to provide a construction of chimney whereby the portion of the chimney most eX- posed to the heat of the flame will be protected and kept cool and prevented from becoming blistered or otherwise injured, and whereby contact between the mantle and the chimney will be prevented, thus prolonging the life of the chimney and mantle.

The invention consists of the features of construction, combination and arrangement of parts hereinafter fully described and claimed, reference being had to the accompanying drawings, in which Figure l is a view in side elevation of a mantle and chimney embodying my invention. Fig. 2 is a vertical longitudinal sec tion of the same. Fig. 3 is a transverse sec tion on the line 3-3 of Fig. l. Fig. 4 is a detail view showing the mode of supporting the mantle.

Referring to the drawings, 1 designates a transparent chimney, composed of one or more pieces of mica 2 suitably secured to a frame composed of top and bottom rings 3 and 4 and an annular series of longitudinal connecting strips 5. Secured to the bottom ring 4 by angular continuations 6 of the bent strips 5 is a base formed of a tube 7 of perforated sheet metal, which tube is of smaller diameter than said ring, and a flange 8 vextending between the upper edge of the tube and the lower edge of the ring, which flange is also formed of perforated sheet metal, as shown. The lower ends or continuations 6 of the metallic strip 5 are connected with the body portions of said strips by angularly bent or offset portions 5, which extend beneath the flange 8, ring 4 and edge of the metallic body and through slits 6il formed in the tube 7, the extensions 6 projecting downwardly on the inner side of said tube and being clamped against the tube by a folded or inturned port-ion 7a at the lower edge of the tube, as shown.

The mantle 8 is provided at its upper end with the usual suspending loop 9, and is supported from the frame ring 3 by a flexible cord l0, of asbestos or other suitable flexible non combustible material. This cord is passed through openings 11 formed in diametrically opposite sides of the ring 3 and has its ends tied or otherwise suitably united as at l2. The strands of the cord are, for purposes of securing additional strength intertwisted, and one of said strands is passed loosely through the loop 9, while the other strand is formed with a tie 13 to engage the loop, by which t-he mantle is iirmly supported in position against sagging, while at the same time is permitted to have a universal swinging movement. By this mode of sus-- pending the mantle, the latter is permitted to adjust itself to variations in the change of position of the chimney and to accommodate itself to shocks and jars received by the chimney, so that it is much less liable to be broken or injured than if it were rigidly mounted in the usual manner or permitted to have only a slight degree of swinging motion. The mantle is also free from contact with the burner or parts of the chimney, and, hence, can not be injured by physical engagement therewith.

The lower end of the mantle extends into the tube 7 which receives the burner and is of sulciently less diameter than the tube to provide a space for the free passage of air and to permit the mantle to have a' desired independent swinging motion for the purpose above described. In order to prevent the lower edge of the mantle from raveling, disintegrating or becoming injured by contact with extraneous objects, such portion of the mantle is thickened and reinforced, pref erably by turning the edge of the mantle outwardly and upwardly in the form of a roll 14. The perforations in the ring 7 and flan'ge 8 are of sufliciently restricted size to prevent injury to the mantle from the introduction of a match in attempts to light the mantle from below, and said ring and flange are so arranged as to admit air around and for a suilicient distance above the lower end of the mantle to promote combustion of the gas at this point, as well as to keep the base of the chimney cool, so that it can not become blistered or otherwise injured from the effects of the heat from the flame, as is a common objection with mica chimneys of ordinary construction. It will thus be apparent that the mantle and lamp are adapted to eifectually withstand shocks, jars, and rough handlingv without liability of breakage, while the mantle will remain unaffected by vibrations from the lamp fixtures and the chimney by the heat of the flame, so that the article may be used for a long period before sulicient deterioration has occurred to require its discardment.

It will be observed that with the construction described the perforated base is adapted to admit air around and above the base of the mantle and between the same and the bottom of the body of the chimney, by which combustion of the gas is promoted, while at the same time the flame from the burner is prevented from coming in direct contact with the chimney and the latter is consequently kept cool and. prevented from becoming blistered or otherwise injured. A chimney constructed in accordance with my invention consequently possesses durability and capacity for wear rendering it economical in use, as will be readily understood.

Copies of this patent may be obtained for Having described my invention, I claim An incandescent lamp chimney comprising a hollow mica body, bands secured to and reinforcing the upper and lower ends of the body, a perforated sheet metal cylinder depending from the lower end of the body and of less diameter than said body, a perforated horizontal flange connecting the upper edge of the cylinder with the lower 'reinforcing band, said cylinder being provided with slits in its sides adjacent said flange, and longitudinal reinforcing strips secured to the reinforcing bands and having oEset portions extending lbeneath thev horizontal flange and through the slits into the cylinder and down upon the inner side thereof, and secured at their lower ends to -the lower edge of the cylinder.

In testimony whereof I affix my signature 1n presence of two witnesses.

BENJIMAN FRANKLIN HARMAN,

ve centseachfby addressing the Commissioner of Patents, Washingtcn, D. C. 

